fix(@angular-devkit/build-angular): add `@angular/platform-server` as an optional peer dependency
fix(@angular-devkit/build-angular): add `@angular/platform-server` as an optional peer dependency

`@angular/platform-server` is now an optional peer dep due to the recent changes in https://github.com/angular/angular-cli/blob/1cd53d6be17d6199b6af74a5a1686b3cb8f52268/packages/angular_devkit/build_angular/src/builders/server/index.ts#L182

clydin/angular-cli,angular/angular-cli,clydin/angular-cli,angular/angular-cli,angular/angular-cli,angular/angular-cli,clydin/angular-cli,clydin/angular-cli